package edu.jamestang.yeb.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author JamesTang
 * @date 2021/12/13 14:22
 */
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Value("${jwt.tokenHeader}")
    private String tokenHeader;

    @Value("${jwt.tokenHead}")
    private String tokenHead;

    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        String authHeader = request.getHeader(tokenHeader);
        if(null != authHeader && authHeader.startsWith(tokenHead)){
            String authToken = authHeader.substring(tokenHead.length());
            String username = jwtTokenUtil.getUserNameFromToken(authToken);

            //has token but not login
            if(null != username && null == SecurityContextHolder.getContext().getAuthentication()){

                //login
                UserDetails userDetails = userDetailsService.loadUserByUsername(username);

                if(jwtTokenUtil.validateToken(authToken,userDetails)){
                    UsernamePasswordAuthenticationToken authenticationToken = new
                            UsernamePasswordAuthenticationToken(userDetails,null,userDetails.getAuthorities());

                    authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));

                    SecurityContextHolder.getContext().setAuthentication(authenticationToken);

                }
            }
        }
        filterChain.doFilter(request,response);
    }
}
